feat: trust extensions

[alienvspredator]

What this PR does / why we need it:

Setup trust with an extensible OIDC flow.

Special notes for your reviewer:

The PR introduces breaking changes in the TrustMapping api.

Release note:

- Remove sessionmanager.oidcmapping.v1 package.
- Define sessionmanager.trustmapping.v1 package.
- Define trust.oidc.v1 and trust.oidc.flow.v1 packages.
- Update protovalidate to v1.2.0.

feat: trust mapping

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[github-actions]

The latest Buf updates on your PR. Results from workflow Buf CI / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	❌ failed (1)	May 22, 2026, 5:37 PM